Does your model have a pressure switch that might be failing and tripping it off before the pressure is reached, or a blockage or kink in the hose?
The video could be misleading. It is true that you might get a stuck motor spinning by forcing it to start spinning manually till enough friction is overcome for the motor torque to keep it spinning but if that is the problem, you barely have a gap and the same corrosion that shouldn't be there will soon enough grow back.
Plus it may not be the problem. Did it get wet inside? The seal behind the impeller may have failed if not magnetic driven. It might instead have failed from lack of lubrication in the bearings and the last thing you should do then is try to force it to spin then run it for a long time chewing up the bearings instead of only moving the shaft enough to get it apart far enough to lube the bearings.
If your impeller is shot and falling apart that too could cause it to not spin freely. You could have motor coils shorting out, especially if you do have enough corrosion to also impede rotation, that can easily abrade away the winding enamel.
A decent motor can be taken apart. See if you can and look for problems. Lube the bearings while you have access. Check the motor capacitor if it has one. Check the resistance of the windings with a multimeter.
If you can't get it apart, odds are you will need a new pump soon even if you manage to get it to spin for a while but I suppose a while beats nothing if it were something like a hurricane, flooding basement, etc emergency scenario.
Does it have a built in fan and might that need cleaned and it's mostly overheating? That too, should be obvious if you can get it disassembled.
Wayne has some parts for a few of theirs:
https://www.waynepumps.com/product-category/wayne-replacement-parts-and-accessories/?product-page=2